The correct answer is: D. Silica
Silica is the main component of silicon dioxide, which is the primary material used in the manufacturing of semiconductor devices. Silicon dioxide is a very stable material with a high melting point, making it ideal for use in high-temperature environments. It is also a good insulator, which helps to prevent the flow of current between different parts of the chip.
Copper is a good conductor of electricity, but it is not as stable as silica and can corrode easily. Iron is also a good conductor of electricity, but it is not as strong as silica and can be easily damaged. Gold and silver are both good conductors of electricity and are very stable, but they are also very expensive.
None of the above options are correct.